# Master Flow 8 in. x 4 in. R6 Duct Board Insulated Register Box

**Brand:** [Master Flow](https://shop.coreranger.com/brands/Master%20Flow)
**SKU:** DIRB8X4
**Price:** $20.55 · in stock
**URL:** https://shop.coreranger.com/product/master-flow-8-in-x-4-in-r6-duct-board-insulated-register-box-100135701

## Specifications

| Spec | Value |
|---|---|
| Model # | DIRB8X4 |
| Pack Size | 1 |
| Internet # | 100135701 |
| Returnable | 90-Day |
| Store SKU # | 685800 |
| HVAC application | All HVAC types |
| Product Depth (in.) | 8 in |
| Product Width (in.) | 12 in |
| Product Height (in.) | 4.5 in |
| Product Weight (lb.) | 2.06 lb |
| Manufacturer Warranty | Free from Manufacturer Defect at Time of Delivery. |
| Brand/Model Compatibility | Universal |

## Description

The Master Flow 8 in. x 4 in. Insulated Duct board Register Box helps connect a round pipe or insulated flexible duct to an air register or grill. This duct board is pre-insulated with R6 fiberglass insulation. The insulation helps to absorb condensation and noise for a quiet and efficient system. This register box has a minimum temperature rating of 100 degree F and a maximum temperature rating of 390 degree F.

• Transition from pipe or insulated flex duct to register grille
• Durable galvanized steel construction
• R6 ductboard insulation, no need to wrap